package com.itheima.reggine.filter;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Runqiang Jiang
 * @create 2022/4/17 10:06
 */

import com.alibaba.fastjson.JSON;
import com.itheima.reggine.common.BaseContext;
import com.itheima.reggine.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/**
 * 检查用户是否已经完成登录
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    // 路径匹配器，支持通配符
    public static  final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 1、获取本次请求的URI
        // 定义不需要处理的请求路径
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        String [] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        // 2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        // 3、如果不需要处理，则直接放行
        if(check){
            // 放行
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        // 4-1、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录,用户ID为:{}",request.getSession().getAttribute("employee"));
            Long empId= (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);
            // 放行
            filterChain.doFilter(request, response);
            return;
        };
        log.info("用户未登录");
        // 4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录,用户ID为:{}",request.getSession().getAttribute("user"));
            Long userId= (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            long id = Thread.currentThread().getId();
            log.info("线程id为：{}",id);
            // 放行
            filterChain.doFilter(request, response);
            return;
        };
        log.info("用户未登录");
        // 5、如果未登录则返回未登录结果,通过输出流的方式，向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     *  路径匹配 检查本次路径是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;

    }
}
